What is the value of the expression modeled by the decimal grids?

The value of the expression modeled by the decimal grids is 4.13

Step-by-step explanation:

Question is incomplete (the decimal grids are missing; see attachment for complete question).

Few points to be noted when reading a decimal grid are.

1. The scale of the grid

2. The ratio of the shaded region to the whole region

3. A fully shaded grid represent 1.

The scale of the grids in this question is a 10 x 10 grid.

10 * 10 = 100

Meaning that there are 100 squares in a grid

Having said this, well proceed to getting the decimal value of each individual grids.

For grids before the addition sign (+)

The first grid is fully shaded; so, it'll be represented with 1

The second grid is also fully shaded; thus, it'll also be represented with 1

The third grid has some of its region shaded; 23 of the 100 squares are shaded.

So, the third grid = 23/100 = 0.23

The Summation of the grids before the addition is 1 + 1 + 0.23 = 2.23

We move to the grids after the addition sign.

The first grid is fully shaded; so, it'll be represented with 1.

The second grid has some of its region shaded; 90 of the 100 squares are shaded.

So, the second grid = 90/100 = 0.90

The Summation of the grids after the addition sign is 1 + 0.90 = 1.90

Now, we can properly represent the grids in decimal forms.

This will be represented as

2.23 + 1.90

And that's equal to

4.13

Hence, the value of the expression modeled by the decimal grids is 4.13